He’s trying to talk to his son about the disturbing sexual material he found under his bed. His son needs to see that his sexual inclinations are perverted and wrong, disrespectful to his mother, his grandmother, and women.
But how can a mere kid tell between what’s right and what’s wrong, growing up in a home where abuse is a way of life?
Like a family heirloom, abuse is almost always handed down from parent to child, in a tragic cycle of violence. It’s hard to imagine love and affection in other permutations when your own father hits you for your own good.